C****************************************************************
C* 								*
C*								*
C*	DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY *
C*	EITHER FOR THE CREATION OR FOR THE CLINICAL EFFICACY	*
C*	OF THIS PROGRAM. USERS MUST ASSUME FULL RESPONSIBILITY	*
C*	FOR ANY RESULTS OR DIAGNOSES OBTAINED FROM THE USE	*
C*	OF THIS PROGRAM. QUESTIONS ON THE EXECUTION OF THIS	*
C*	PROGRAM MUST BE REFERRED BACK TO THE ORIGINAL AUTHOR.	*
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C* AUTHOR:	SALLY FORSTER					*
C*		C/O DEPARTMENT OF NUCLEAR MEDICINE		*
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C*		LONDON, ENGLAND					*
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C*		TEL: 01-407-7600 EXT 2583/4			*
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C****************************************************************
	FUNCTION CRES(Y,IX1,IX2,YFIT)
	REAL*8 CRES
	DIMENSION Y(1),YFIT(1)
11	CRES=0
	DO 30 I=IX1,IX2
30	CRES=CRES+(Y(I)-YFIT(I))**2
	RETURN
	END